How can caves be dangerous?

You can fall INTO things (holes) things can fall ON you (rocks) and you can get stuck in tight spaces. Some caves may have health hazards from bats and bat droppings, or drowning hazards from water. Some caves may have ventilation problems and hold bad air. And they are all rather cool, and quite dark when the lights go out.

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They are more than "quite" dark if all your lights fail. They are totally, absolutely dark! In taking up the hobby of caving you learn how to recognise the intrinsic hazards and how to minimise the risks from them.